Telephone system.



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erstehen@ 'scter, al line or ycallingsignal isassociated withV each.` line` terminal: at the central sta--V tion. i ,@n addition to' these, lthe central oper-fz ator isfprovicled with supervlsoryor clearI ing-out signals. It is also customary to as` sociat'e a battery withthe switchboard ap` porotos, atthe central station. The,` circuit arrangements are such thiit the current from' this battery is employed notonlyy foroper-` ,ating the"microphone` trensmitters at the subststions,

but-also for operating the sig;-v naling devices 'at the. central station. An exchange or central', station :involving s switchboard appsratus or circuit arrangement of this charscter is ordinarily known a common'bsttery enchsnge;

Generallyy stated, theobjectol my invention is toprovide asimple and eihcient telephone system of the oregoin` charscr.

A. special object is to provi e en improved arrangement ci circuitsand relays for oper ating the yline or-callingsignals.

Anotheriobject is toprovide an improved' arrangement of circuits and impedance coils y :tor sunplying current directly to the lines.

A `fiirtherobject is to providean improved arrangement of circuits `and relays: for operating the supervisory'or clearing-V out signals. .l l 'i in addition to these, it is also an object to rovide certain details and. features of improvementtending to increase the general oiioiency rendite render atelephone system. out this type more, serviceable and reliable` ineen-.w i 4.- To? the foregoing;- and? other useful Tends,

.invontionconsists in mettere hereinafter .orthyand cleimeeh.I .tn the eccompenying drawinrfs, Figure 1: is a diagram illustrating a' telephone system genossen eminem si, isos. semiiosses.

minoranze. meenten is, rois embodying the principles oi my invention. linwthis figure, two subststions ere shown connectedwith a central station, and a cordcircuit is shown at the latter stetion for Iesteblishing connection between the spring -jacltsrof thetwo lines. it will be resdilj..Y understoodthat'only such instruments, devices andjcircuit connections are shown es are necessary to a full understanding? of the invention.'l yFig. 2 is a simplified ingram Vofgthe circuit arrangement shotvn in Fig. 1,' illustrating the method of sup lying cur rent directly to the subscribers ines. Fig. 3- is afsimplified diagram o the circuit sa rangement for the line relays employed tor :cperaltingone of the line s1gnels,shown in.

Asthus illustratedand assuming that the subscriber at substation A desires connection with thel subscriber at substation B, the o erations and circuit connections which 'receiver avis lifted from' the hook-switch substation-A,sline circuit is completed from the common or centralized battery E?, through the battery-lend 1, through-the impedance coilv 2, through the coil 3 of the diferentisi line relay R, thence through the conductor fi, thence through the coil 5 o the supplemental line relay q', through the conductor 6through the limb or line conductor 7, through the subscrihers transmitter 3, through the .primery 9 oit the induction ooit, through the contact-point 10, thence through the hook-switch 11, through the other line conductor 12, `throu Il1 the conductor 13, thrbugh the-other coil 14 of the said diter entialrelay, thence through the impedance coil l5 and through'thebattery leed 1G to said battery. The current flowing through this completed line circuit energizes the supplemental relay r, but, owing to the dirlerential Winding, does not energize the relcy R. The supplemental relsy a', now enegized, attracts its armature end completes short local circuit through the buttery D. through" the conductors 1 and 1'?, thence through the armature 18 and the Contact point 19, through the line lamp 20, thones throughtheground or common connections @1an .T2 to said bett/ery. The current tiene 'ing through this locsl circuit is suticient tr it en; take plsceare esfollows. When the XZ `oit seid yjack,

eEsT AVAILABLE CGP ineen/is suse the lern 20 to glowhthereby, attract; theettention of thefcehtralo erudtopfnncli; indiceting thet the subscriber it sub'stiton desires Hto ,give an order for connection. "string this' "signal the` centrslfoperetortnehinserts' the dnsiveririg plug of the' crdfcircuit in the jack corresponding to the linev of the substation' A. rlfhis act, itbwillhe, seen, operates to close a the buttery Dthrough the conductor V22, thence through" the' "coil of' supervisory ife-iy luy 23 through the condut'zlor 2li,j thence through the talking,` strand-25 of the cordcircuit, through the sleeve contuct 26' of'seid plug, throunfh the sleeve contact 'on' thimble through the conductor 128, through the conductor 13, throughicoilfll of the differential-relay, ond thence through) the impedance coil 15 und A'conductorltftol seid battery." 11n this-Wztyythellcw of cur^A rent through the rcoil 14=hasin'creas`ed to au extent to energizethe relay R 3 causing it to= attract itsl armature. ln additiontothis, the insertion lof the answering i plug completesre linefcircuitffrom lthe battery D, th...i'n'zghfconductor'22` and the coil 'oif the supervisory yrelug 29,.: thence throughttlie conducto-ritt) en' "thetalking stru'ncl 1310i; the cordlcircuit'g-:through` the plugfllcohtsct 32 end the jack spring 33, thence .through the :line conductor r(tunel-the transmitter 8, throughthe coil 9 of the induction coil, through the contact-pointl 101sndithe hook-v sriitch 11 thence through the Iline conductor 12,1 nndx'tne conductor- 13,uthrou`gh the coil 1li lo the dicrentisl relay,- vthence Athrough the impedance coil? lnnd the conductor 16, to suie 'batteryu i illhus, the current lowing `1hrough. the 'coil file is turtlier ieugmented, causing the dierential -rela'y R,'fes"steted, te nttrect itsiorr'nature'. .The Suid ermeture, when attracted'Vclosesfa shunt around 'the supplemental line `relay rl This shunt, it will be seen, consists ofthelurmature 84, contuct-point: 35, undy theconductor 36," the currentpussing through Vthis shunt, rather theuthrough the coil of 'thefsoid `sup lementel line reley. When short-'circuits in this msnner, the supplemental line reley'fv ceeses to` attract its armature, andthe said errnnture being releas'ede lirr-this n1enner opens the local circuit including the lump 2G; ln this wey, the insertion o the answering plug oit the cord-circuit serves tol auto- .ineticrllly extinguisher-restore the line siglt Willbe seen that the passage of current, in fthe manner previously described, through the relays ZBend 29, causes thesev reluys tof attract their armatures, therelay being energized by thevcurrentliowing u l n 1 Atlircuii s. looolclrcultincludingthe sleeve contects ofthe plue'und jack, andthe' relay 2,9v being energized? by the current? liowing through'-ul =line circuit including the fli'oolr-- switch at the substation. Consequently, us

'After 'receiving local circuit from f `42 and 43, thence t will hereinatermore fully, eppcar, the reley 29de dcencrgised as vsoon ns the subscriber hangs up the receiver, Whlle the reley is not decnergized until the operator with- 'draws the plug from the jack.

, i the order for the connection desired, it being understood that this con. be accomplished in any well-known or 'approved manner, the operator then inserts the calling plug of the cord-circuit in the j'nck' corresponthn to the line of substation Bi l' This, 1t Willnbe observed, completes a local circuit from the buttery D, through the conductor 22, through the coil of supervisory relay 37, thence through the conductorBSnnd the talking strand 39 of t-he cord circuit, through the sleeve contact l100i the culling plug, through the sleeve or thimble 41 of vthe said jack through the conductors rough the coil eet of the di'erentul relay R', thence through the impedance coil L15 and the conductor i6 to said buttery. With current flowing through but one of these coils, it will be seen that the dierentiel relsy R is energized to an en tent to attract its armature. rl`he act or serting the ,calling lug completes another locullcircuit from t e'battery D, through the conductor 22, through the conductor T3, thence through the armature 7e, through contuctpoint 7 5 through he superyis r lamp 76, through the contuct-point 77 the armature 78, thelutter having been f tructed by the energizing or the supervisory reluy 37, andy thence through the ground or common connections 79 und 72 to seid csttery. Thus the insertion ofthe calling flug causesl the supervisory lump 7 6 to g ou?. This lump, as Will be seen, continues to glow until the called subscriber responds to the cull. When the celled subscriber removes the receiver vfrom the hook-switch ut sul)- station B, a' line lcircuit is completed from the batter D, through conductor 22, through the coil o supervisor relay 60, through the conductor 61, throng the talking strand 32 of the cord-circuit, through the plug tip G3, through the jack spring 64, thence through the line conductor 54 und the hook-switch 55, through the contact point 56 und the primary of the induction coil, thence through the subscribers transmitter 57', through the conductor 58,-through the limb or conductor 59 of the line, throu h the conductor e3, throu,h the coil 44; or the diiierentiul line relay t', thence through the impedance coil 45, and the conductor 46 to said buttery. In this wey, as in the previous case, the ioifs ocurrent through 'one coil off the difierentiul line relay isaugmented by the completion of the line circuit. rlhe flow of current through'this line-circuit energizes the reins y(50, causing it to attract its armature, und 'to` thereby open or breuk the local circuit through the supervisory lamp 76. Thus, as

nection.

eesr AvAiLAeLs Coe,

weaves if stated, this 'lamp -4 is vextinguished by t the called subscriber in answering the call. Both receivers being oi the hook-switches at .the

tivo substations, the subscribers are novvy connected'up for conversation. ,Itfivill begseen tacts ci the` plugsandjac s. .Itvvillalso be seen that the ytalking circuit includes the condensers E,.Which are located in tlietalk-I ing strands of the cordcircuit...When con nested up the two lines receive current directlyrom the battery. rJiheinsertion of the calling plug in the called subscribers geckhavin g operated to. energize the difderential line relay It', causing it to attract its armature, the supplemental line relay r does not eccome energized. This `is for the reason, asin the previous case, that current is shunted `around this line relay rather than allowed to pass'through it. rllhe s aid shunt `around the line relay r consists preferably,

as in the previous case, of .the armature 50,

the contact-point .51, and rtlieconductor 32. in this `way, it ivllbe seen-- that theflinersignalapparatus of` oneline is similar to the line signal apparatus o: theuotllier.,line, and. that consequently either subscribercan send in a call in the manner `first described. vf

` ll/lientlie subscribers havefinished tall:-

` ing, the act of hanging up `the receiveiisautol niatically signals i the operator for `.diseon-i For example the subscriber` at.

substation A, in hanging up the receiver, opens the line circuitincluding supervisory relay 29, allowingthezlatter torelease its armature. Said armature whenv released completes a local circuit :from the battery D, through conductors 22 and 65, thence through` the armature 66, contact-point 67, `through the supervisory lamp 68 and the contactpoint 39, thence through the armature 'i'O and the ground or coniinonconnections '(1' and T2 to said battery. .,lhecurrent lowing through this local circuit causes thesupervisory lamp 653y to'glow, thereby attracting.

the attention of the central operator and indicating that thesubscriber atsubstation A is ready to be disconnected.. In a similar inaiiner,when the subscriber at substation B hangs iipthe. receiver, the line circuit including the supervisory. relay 60 is opened `thereby allowing the armature 74 to fall back into its normal position against the resting Contact 75.1 This closes the previously described local-circuit including the lamp 7G, causing the latter to glow and in thisivay `advisingr the operator l that the called subscriber is also `ready to, bedisconnected. The double supervisory signal apparatus having given a-signal for disconnection, the operator thenfvvithdravvs both plugs.

from the two jacks, and thesystein is then in'its normal or disconnected condition, so far as the two subscribers shown and described vare concerned.

Thus it will be seen that by my invention I provide a simple and eicient telephone system of the common battery type, and, furthermore, that the eiliciency and various advantages are obtained in a circuit having two-way jacks and plugs. In this Way, I provide an exceedingly simple and etiicient two-Way circuit. In addition, the vcoils or the differential relays serve as impedance for suppl ing current directly to the lines, and,\as s own and described, further inipedance or retardation can be obtained by employing the impedance coils 2, l5, 48, and

45, These impedance coils can, however, be

employed-or not, as the conditions may require, and,if desired, the coils o the differential relays can be made the sole means of im edance or retardation between the lines an the source of current. fis another advantage, it will be seen that the line signals will not light up or 'glow as a result of accidentally grounding either side ci e. sub- 1 scribers ine. r)The dierentially Wound electro-magnets not only serve as impedance for the current supply, ut also as relays for 'automatically closing shunts around the line relays'vvhen the plugs are inserted in the ]acks, so asto automatically restore the line sinals. I fr -claim as my invention:

1. A telephone Aswitchboard a paratus comprising a sprino jack, a subscri ers line connected with sai spring jack, an operators cord-circuit provided with a plug adapted Jtor insertion in said jack, a battery connected with the line, a line relay, a suppleniental line relay, a'shunt around said supplemental relay, a normally open switchpoint in said shunt controlled by said line relay, a line lamp having a local circuit including said battery, and a normally onen switch-point in said local circuit controlled lby said su plemental line relay.

2. A. te ephone switch-board apparatus comprising a line signal, a relay for operating the line signal, means for supplying our rent through the coil of said relay, a normally open line shunt around said relay, and aline relay for closing said shunt.

3. In a telephone system, the combination of a subscribers line, a relay having its coil in the line, means for supplying current to the' line through the coil of said relay, a shunt permanently connected with thc line and extending around said relay, a normally -open switch-point in said shunt, a line signal operated by said relay, and a second relay or closing said switch-point.

4. In a telephone system, the combination of a subscribers line, a dierential line relay, a supplemental line relay, `means for supplying current to the line through both oaf snbscribersline,

sides' 'of the 1ine,ixn

,supplemental line relay,

- said supplemental line relay,

ywith eachside` of eser AvAiLAeLE con.'V

said relays'ge "shuntaround 'said supple? r entfal ylinerrelay, a i'i'orinally open switch# peint in said shunt controlled by said 'dierl entiajl: relay,1-and afline signal :controlled by saidrsuppleinent-alline'relay." ,j 5; In raitelephone system, the combination' a source of current, Fa' differential relay `having its coils arranged' te serre as'impedance or retardation throughV which current"-l is suppliedflto the line," a springiaclrfconnccted with theline, an opcra? rs cord-circuit provided Wit-ira plug adapted for linsertion in'said jack, a supple# mental line' relay, a line signal controlledby e shunt around: said supplemental -line'vrelayya 4normally open switch-point in said shunt controlled' by said-'di'erentialline relay, andls'uitable connections'wherebythe insertion of said' il-ng'in said jack causes the 'diterential're- 6.-'n av telephone lsystem, the combination of a vsubscriber-s v1ine,"a battery connected i the line, av di erential relay having its coils connected in opposite edance `coils interposed, betweenfthe saiddi erential relayandsaid battery, a' supplemental line relay connected between onef side of the line and one of the' diderential relay coils, a shunt around ,said a normally open so as to restorel the switch-point in sai'dvshunt controlled'by'said circuity including said battery U l open 'switcnpointf in-` said 'localA circuit lco differential relay,a line lamp having a'local a normally" trolled by said supplemental relay, and. suit-- ablev connections''or closing a local circuitl through one coilof saiddiiierentialv relay,

.so as to cause the -latterto' close said shunt and thereby 'denergize' the supplemental re lay' and extinguish said lamp.

7, ln a telephone system, tliecombination o aisubscribers line,ffa .differential line relay,`mcans for supplying current to the line through the coils of s aid dilieientialrline' relay, 'a'suppleniental line relay, a line lamp hav-ingle local Icircuit including said battery, a normally open switch-point in said local-circuit controlled by said supplemental line relay, a shunt around said supplemental line relay, a normally open switclipoint in said shunt controlled by said diierential line relay, a spring jack connected with the line, an operatorie lcord-circuit provided. Withxa plug adapted for insertion in said jack, a supervisory relay associated with the cord fcircuit,"and suitable connections wherebythe insertion of the plug; in' the jack op vcrates' to complete 'a local circuit through, the

said supervisoryrelay, and" whereby the' said local=`circuit-includesone coil of said diercntial'reiay;

oit-a subscribers line, a line signal, means y Y 9J'In a telephone system,

or a subscribers 'ablesource of current, suitable connections 'andcircuit closing` devices for causing the y geen res foi supplying current, a line relay for cana ingthe-display of saidsignal, a normally open line'shunt adapted to be closed for the purpose of dener'gizing said line relay, and a't diieeren'tial'relay connected and arranged to"controlsaidfshunt.

the combination of' a subscriber-s line, a line sional, a suith able source of current,- a normally open line shunta'dapted to be closed to effect the restoration o said signal, means about which the shuntis closed and a ditiferential relay connected 'and' arranged to control said shunt.`

10.`-n a telephone systern,the combination line, a line signal, a suitdispla'y'of said signal, a normally open line shunt and'a diii'erential relay connected in the line and arranged to control said shunt, the latter when closed causing the restora- :tion of said signal, and means about vwhich the shunt is closed.'

11. In ateleplione system,the combination of a subscribers line, a two-way jaclr connected With the' line, an operators cord-circuit'- provided with a two-way plug adapted for insertion .in said jack, a source of current permanently connected with the line, a differential line relay lthrough which current-'is supplied to the line, a supplemental line'rel'ay having its coil arranged to serve as'ne'diuin' off-electrical connection between one coilofthe differential relay and the tip A side of the line, a shunt around said supplemental lin'e relay, a normally open switchpoint in'said shunt controlled by said dii'- erential relay, a supervisory relay associated with the cord-circuit,i a line lamp huying a' local circuit including said source of current, a normally open switch-point in the circuit of said lamp controlled by said supplemental relay, and suitable connections whereby theI insert-ion of the plugr in the jack completes a local-circuit including the supervisory relay and one coil of the differ- 'ential relay, and also including the sleeve contacts of the plug' and jack.

12. liiatelephone systein,tlie combination of a subscribers line, a subscribers hookswitch forl opening and closing the line circuit, a two-way jack connected with the line, an operators cord-circuit provided with a two-way plug;r adapted for insertion in said jack, a suitable source of current perinanently connected with the line, a diierential line relay through which current is supplied `to the'line, a supplemental line relay con- -'nectedfbetween'one coil of the diiierential relayand tiieitip side of the line, a shunt around said supplemental relay, a' normally vopen switch-point in Said shunt. controlled 8. in 'a telephone system, the combination' by said diii'erential relay, a supervisory relay connected between the source of current tion' ci* 'a com line rela said shunt i .Ae/Amare cor:

recense i d"tii`c"tip strand of said cordrcircuit, a secondl` supervisory Irelay* connected between the source of current and the fsleeve: zstrand et' the cord-circuit; a line 'signal controlled hy said supplem'cnt'al'relay, and suitable con'-l n'ecticns whereby thefnsertion'fo the plug;l in 'the jack compltesl'a 'local circuit includingsthc' second 'superyisoryf'rclay and one' coil o theL difierential'rel'yjandalso includinfg'theslcoycrontacts oi 'the plug and 3.3.-1ln a telephone system, the combination oi"- a subscriliers line, a line signal 4associated rritlrthe line,f a E"source oi" current permancntl'y connectedwith the line, a diierential lino relay and asupplcmental line'relay, ay ncrmally'op'en shunt adapted and arrangedy tofceperate inl controlling. said "line signal', V a''siipcryisoryj relay,l a' norrriallyl open lino circult`includin,r l;t one coil "of the diere'ntial relay and also the coilfofthe vsupervisory relay, andQaA s'ubscribers"hook-switch. also included the said-line circuit.` le'. in a telephone 'system,the combination o'asuhscribes line,l a"`two`vay jack, a` cordscircuit having' a'twoway plug adapted for' insertion" in said t jack,y "a `suitable line signal, a suitablesource of'currcnt, a shunt permanently'connectcd in theline and means :controlled therebyifor effecting the' restoration of said signal, a normallyjopen switcha relay forI controlling'saidswitch-polnt," ji* iii. iin' 'a tele vhone system,

"gets netallic'fliiie circuit,`

diiierential re ay'hav'ing" its Windings'iii' eluded in opposite' sides' o'dsaidl circuit'ga'f line signal, a line relay, for. op'eratinsrjsiiid signal, a normally openshunt'aroun said being 'controlled by saidl diiere'ntial relay, anoperato'rs cord circuit adapted'to be 'connected Withthe said line circuit, v a lino circuit 'and vconnected with tlie'u cordI cir-vll "urs' ,combina e cuit, and suitableconnections t'or"including1 one strand othecord circuit and'one' triading; of saiddii`erential relay ina 1o`calcir-".

lo. ln a tion of a metallic plin'e circuit," a dierential relay having its'tyindings included in opposite sides of said l line""c1rcuii^f fa line signal, a line relay fior 'operatingsaid' signal, 'a normally open' shunt `around saidyiline relay" controlled by saidjdiierential relay, an operatcrs cord circuit adapted tojbe connected 'withlltho vv,lino circuit, )a supervisory` relay "andfa f1 supervisory `signal fesso-' cio-:tedi with l,tloe', cc'rdfcircuit, a ibattery a, itli the cord circuit, Lthe connections ,loeirgl sucia that the said su' eryisry'reley' and 'one' a'ind'n't ci" the said) dilerential s' relay are r include ,inA a local circuitfrvhen theo cr-`A ators cord circuit is connected'with the' ine.

battery included' ir1"the,y

telephone system, the comlrina#v T17. In 'a telephone system the combination off alinc' circuit a dincrential relay havingits coils includcdin opposite sides ofsaid'circuit, anopcrators cord circuit adapted to becon'nected with the said line circuit,a'batteryin the line circuit and connected: ith the cord circuit, a supervisory relay and'suitable connections for including one strand of the cord circuit," the sud erential relay in a local circuit.

18. ylin a telephone system, the combine,- tion of suitable connections forming a talliing circuit a condenser in 4each side of the circuit, and means for supplying current to the;4 circuit. at each side of said condensers, differential 4relays having coils throufh which the current is supplied to the circuit, im edance coils interposed between the circuit supply and the coils of said relays, suitable line signals adapted to he restored to normal by said relays, and supervisory rc lays each adapted to be included in local circuit with one Winding oi a differential relay.

19.*In a telephone system, the combination of suitable connections forming a talkingcircuit, a condenser in each side of the circuit, means forV supplying current to the circuit"atpoints each side of said condensers, dierential relays having coils through which' current is su plied to the talking cir cuit,'line signals va apted to `loe restored to normal by said differential relays, and sueripr'isory relays each inlocal circuit with one winding oi difierential relay.

2d. lin a telephone system, the comhination '035 a lsuhscrihers line, a suitahlc line signal, a suitable source ci current supply, suitable connections andcircuit closing,- vicesor causingthe display of said signal, a ,diilerential' line relay connected and arrangedf'to l'cause the restoration of said signal, 'and a 'supervisory' relay adapted to he included lin'\local circuit with a portion o the tallrin'h` circuit' and one Winding or said dismessi relay; 21. A telephone system comprising a sul scribers line, suitable line signal apparatus,

:currentwadapted4 'to supply current to the lline'thr'ou h the winding of said ydilierential Irelayfor' oth talking and si naling purposes, 'apair ofsupcrvisory re ays a plug switch','for' controlling one of sai superm viscry relays,l 'a'subscrihcrs switch adapted, ,to control thcfother supervisory relay when said lug switch is'closed, and a supervisory signa vcontrolled conjointly hy said supern "Visoryrela'ysfj 22;".Atelephone system'coinprising a su';c 'scrihers' line, suitable line 'siga-"ral apps ratios,

a non-sensitive relay in the line circuit Afor visory relay, and one Winding oi said dierf :a di'eren'tial relay for restoring the line signal to-norrnahfa centralized source of r ilo adapted to he included BEST estoring the linesigneltoncrmei, n source ci cnrrent .connecte with the line through sensitiye relay, ej pair. of' electro-magnets, n plus: siyitclr-E forgfcontrolling'-both .tlie Jnonsensitive relcy and ne of seid. :electro-mage nets,` y ef, subscribers :switch 'for controlling l siclefoi thetellringc i rc 1.1i tj. 4 25. 1n s telephone system, tenayith e@ "-tclephonelme,

` Lssecieted r with the line switch is closed,f and a. supervisory. signe. controlled-conjointly by said electro-meg- I i i 23.". telephone systexn comprising a subscribors line, acentrnlized source of current c cnncctedwith theline, suitable line signnl epperetus,`

open kshunt circuit controlled by ici*- rcstoring the line signal sensitivefre ey 1nI tlieline, e. Vsupervisory i reley.. inthe c ord circuit, ends plug` switc h n .windinc oi` `eech reley 1n or connectin` n unito `portion or-one series withn; zittery A the combine-` cf e, centrnl soupe@ of current; L line relay normally Wr terpcscd .between one of the limbsl of, amd

line-encionejtermin'ul of seid source, n line by the. actuar-l .e .fmt-0E .relay also l be displeyed 4signnl erle te@ `to tion ci 1 sind line remy,`

.enti ndepteii byits sc tuntionto shunt snicllline reley ,to e iinc e seid signal. i z

" Ofsei, cute.

12e.. ln. n..te lephone'z systein, the c0rnbinef. ,V tion'with e,teleplione line,.oi aline und-e cutci" releyffor .seid line,

rent. 'et the central ..Otc furnlh .energy for. thenctueticn .foi Yssiflreleye, l end Ineens;

:whereby thev actuetion oi seid cuil-.Ofi `relay ...Seid 1111. relay-to prevent its actuation.,;.... y Vi-trg; the :combine of.. c..centrs i ly device for ..the

around .the Ycoil of pieces a shuntv '27, ln miele honesystcin,y tion with n tc eplione line, sourceof current, n signalin line norinnl. ly` in. series Vmit source, 1a. vcut-.o line and ziupted by its nctuntion'f'to `shunt suini linesigneling device to 'render thesamc inoperetive 2S-.f In n' telephone y system, I the combine,-A tion with tele hone-lines, of e central source fof current wit which the lines nre ijiorlnnlly,A

connect.ecl, eline signalling clerics forcee i.

line, s, out-of-Lrelsyor ceclr, line, en oper. Azitorisgccrd circuit` to establish connections Withthe line for-..conyersotion, ssidjout-oiifrelnybeing-operuted n 1 liegneyer tliejcrd cir-. cuit isconnectednwiththe line oven a. ,circuit circuity need.

nelinggrieyice. of energizing current and thereby render the signal inert.

'signaling devicehaving circuit controlled at one point by seid relny, and n line signal adapted and Ineens including a non-sens1-- tive reluy 'in the line circuit and a normally, scid relay to normal. f E `.2gfi-..i^i telenhone system comprising n nonfA 'e sourcegoi cura.

prlsing itsconductor, reley nssocinted :with the Acircuit bein jointly controlled by seid 9.9,.Tlie i combination with telcnhonc line, o abnttcry having? both its poles per.- mcnently connected with n lincnnd serving whenclesired to send-currentorer the telephone linefortheogeretion ci its epperatus,.arelayndnptc to bev included 1n c,

-brnnch circuit completed when c connection isestablishcd witlithe-line, n supervisory the contlnuity of its,

to be retired by the closure o-said branch circuit.

30. The co'rnbfnntion with u telephone line, .of n bntte'ry permanently connected in n. ,brideof the adapte .to be included in a branch circuit the ,central oiiicecomplcted when n conncc-- tionis established `with the line, snidcircuit includfng n portion. of .one line contiuctor` andbeing chargedby current from seidbetf tery, n supervisory signal having itscircuit controlled et one ont by seid relay, and n line si al :idcpteii to benretired by the cicsure'o seid brench circuit.

line, of e battery ermenently connect-eci in. n bridge ofthe lim s of seid line, e conci cir cuit, o, relay .connected with e strand oi the corti circuit .andk the battery, vwhereby 'when n connection is mede with the line e. irc-.neil circuit is Lcompleted for seid rcley, including; thereley con uctor, the cordstrcnd enti n portion of one line conductor, and receiving current Iirorn seiibettcry, n supervisory sig;- nel p lnced ,ino .eretivc conolition by the 'actuation-ot sci relay, ende, line adapted .to be retiredby the closure ci scifi brench,.circuit. .32; The; combination with e telephone line, of-.e line relay in one conductor oi the 1ine, n battery. tween seid con uctor and the other cono-A tluctcr,` scorci circuit, n reley connected thcrewitlnund with the buttery, ineens for includingscid relay in n brunch circuit com the cord circuit, und :i portion .0f Sv-id otherline wnductor, seid b cttery, en aline signall adept/eci tobe retired by the; closure of seid branch circuit.

,33, The combination with e telephone lline, 1o n battery permanently connected in e bridge of tirelirnbsof` seid llnefe corri cir- ;cuit and e pen* of supervisory relays briclxgczl ecross the line when connection is esteblislied bythe cord circuit with the line, one

offseidreluys being in n, pntlr'or current ,supplied for 4chargingtbe trensrnitterct the.. subst stion of. the .linezend the other relay being in` c o branch `.circuit closefiwhen ..2 ,necticna isA mede with .the line, s supervisory relays, enti eisif'nnlnadnpted to be retired by the closure o? said branch circuit.

34. The combination With n telephone `31. The combinntlon with e telephone errnfmently connected loecharged by current from Seial BEST AVAlLABLE CUF" normas 'i bridge of the lim s of :said lineat the cen- :ral oliicc, a cord circuit, supcrvisory'rclavs connected between thc'lcord circuit Iand tie battery,- .eans for including` one ot said relays in a circuit Jfrom the battery when" a connection. is established Iwith' vthe line;- said circuit'including la telephone line to the sub stationwherebyisaid relay is placed under control ot thejsubsc'riber, means'for includthe other relay in a branch circuit whereby said relay is energized as soon as thcvconnection is'esta'blished, a su )ervisory signal having itslcircuit controlled by said relays, land a line signaliadapted to be retired by the closure of said branch circuit.'

35'. rThe combinations-With a-telephone line, oit a battery `having bothk its poles permanently connected with a line and serving 'wheny desired to send currentover the telephone line for the operation of its apparatus, a relay excluded from the talking circuit adapted to be included in a branch circuit completed when a connection is established with the line, a supervisory signaling device having the continuity of its circuit controlled at one point by said relay, and a cut-oli' relay adapted to be energized over said branch circuit.

3S. The combination with a telephone line, ci a line relay permanently included in one conductor of the line, a battery permanently connected between said conductor and the other conductor, a cord circuit, a relay connected therewith and with the battery, and means tor including said relay in a branch circuit comprising its conductor, the cord circuit, a ortion of said other line conductor, sai circuit being charged by current from said battery, and a cut-oid relay adapted to be energized over said branch cirf cuit.

3'?. The combination with a telephone line, of a battery ermanently connected in a bridge ot the limbs ot said line, a cord circuit and a pair of supervisory relays bridged across the line when connection is established by the cord circuit with the line, one ot said relays being in a path for current supplied for charging the transmitter at the substation of the line and the other relay being in a branch circuit closed when connection is made with the line, a su ervisory signal jointly controlled by said re ays, and a cut-oli relay adapted to be energized over said branch circuit.

38. The combination with' a telephone line, of a battery permanently connected in a bridge of the limbs oft said line at the central office, a cord circuit, supervisory relays connected between the cord circuit and the se cry, means for including cnc of said rcin a circuit from the battery when a connection is established with the line, said circuit including a telephone line to the substation whereby said relay is placed under control of the subscriber, and means 'or in cluding the other relay in a branch circuit whereby said relay Jis energized as 'soon the connection is established, a :hiper-VisoriT signal having its circuit' controlled by said relays, and a cut-od relay adapted to be energiaed over said branch circuit.

39; The combination with a calling telephone line, of a battery permanently connected in a bridge of the limbs oli said line, a' cord circuit, a' Irelay connected with strand `of the'cord circuit and the battery, whereby when a connection is made with the calling line a branch circuit is completed for said relay including the'relay conductor, the cord' strand and a portion of one lino conductor, and receiving currentrom said battery ,`a supervisory signal placed in op erative condition by the actuation or said relay, a called line connected with the calling line, and a similar relay connected with the called line.

40. The combination with a calling telcphone line, of a line relay permanently in eluded in one conductor of the line, a battery permanently conducted between said conductor and the other conductor, a cord circuit, a supervisory relay connected therewith and with the battery and excluded from the path of voice currents, means for including said supervisory relay in a branch circuit coinprising its conductor,'the cord circuit and a portion of said other line conductor, said circuit being charged by current from said battery, a called line connected with the calling line, and a similar supervisory relay connected with the called line.

fil. rlhe combination with a callin, telephone line, of a battery permanently con nectcd in a bridge o the limbs ot said liuc, a cord circuit and a pair of supervisory relays bridged across the line when connecticn is established by thc cord circuit -with the line, one of said relays being in a path or current supplied for charging the transmitter at the substation of the calling line, and the other relay being in a branch circuit closed when connection is made With the said line, a supervisory signal jointly controlled by said. relays, a called line connected with the calling line, and a similar pair of relays connected with the called line.

42. The combination with a calling telephone line, of a battery permanently connected in a bridge of the limbs of said line at the central office, a cord circuit, supervisory relays connected between the cord circuit and the battery, means for including one o said relays in a circuit from the battery when a connection is established with the line, said circuit including a telephone line tc the ing' substation, whereby said relay is plee under control of the calling subscriber, means *for including the other relay in e.

BEST AVAILABLE COF" lirrinciiecircuit, whereby-seid relay is enen ss soon cs the connection is established,

n. supervisory signal boring its circuit con- .;,r-ollcdbysmdrelsys, si called line connected with" the culling line, und c similar pair o rcleys .connectedwith the culled line.

lns-tclephone'system, a, cord circuit, two relays for oneend of seid cord circuit, oncfcncrcizedover s derived-local circuit completed ,Whenwconnection is established witlrytlie culling' line, over c line vcircuit including the. subststion o thscalling line, ,two similar relays for the` o t-lierend of saldcord. circuit, having a.

siinilsrirclution tothe cslledlinm superyisory signal controlled by the first pour. of relays, alsupervisory signal controlled by the second psiroi relays, und a battery having ot this' potent bc obtained for five cents each,

` other" end .ofthe cord vsir/"nul controlled by one pourl o' relays, :m-

the .other energized e Illinois, this 16th d? nece ses n both 4poles ,thereof permanently connecte-S. with the telephone lines.

44, -ln sftelephone system, s, cord circuit, two superjfisoryrelsys 'for one enc?. c1"- the cord circuit, two supervisory relays for the circuit, e supervisory ot crfsugervisory signal controlled by the other puirvof relays, s local circuit for cnc reluyof eochnpair, and a buttery having both poles thereo permanent-lyiconnectcd with the telephone lmes.

Signed by me at Chicago, Cook county,

of April, 1902. RY P. CLAUSEN.

Witnessesz:

ARTHUR F. DURAND,

HARRY P. BAUMGABTNER.

by addressing the Commissioner of iatcnts.

Washington, D. C. 

